Answer:
A. Hydrogen and oxygen combines in a constant mole ratio in all the three water samples
B. Carbon and oxygen are combined in a constant mole ratio in all the three samples of carbon dioxide
C. All pure samples of a compound contain the same elements combined in the same proportion by mass
D. Since the same elements are always combining to form a certain compound, and the atoms of each element has its own mass, the atoms of each element combining to form the compound do so in a fixed proportion by mass.
Explanation:
A. molar mass of hydrogen = 1.0 g/mol; molar mass of oxygen = 16 g/mol
The molar ratio of elements in a compound gives the proportion each element is combined with the other by mass.
molar ratio of hydrogen to oxygen in the samples:
Sample 1: Hydrogen; 1.5/1 = 1.5: Oxygen; 12/16 = 0.75
molar ratio = 1.5/0.75 = 2 : 0.75./0.75 = 1
molar ratio = 2:1
Sample 2: Hydrogen; 2/1 = 2: Oxygen; 16/16 = 1
molar ratio = 2/1 = 2 : 1/1 = 1
molar ratio = 2:1
Sample 3: Hydrogen; 2.5/1 = 2.5: Oxygen; 20/16 = 1.25
molar ratio = 2.5/1.25 = 2 : 1.25/1.25 = 1
molar ratio = 2:1
Hydrogen and oxygen combines in a constant mole ratio in all the three water samples
B. molar mass of carbon = 12 g/mol; molar mass of oxygen = 16 g/mol
molar ratio of carbon to oxygen in the samples:
Sample 1: Carbon; 0.5/12 = 0.04 : Oxygen; 1.3/16 = 0.08
molar ratio = 0.04/0.04 = 1 : 0.08/0.04 = 2
molar ratio = 1:2
Sample 2: Carbon; 1.0/12 = 0.083 : Oxygen; 2.7/16 = 0.168
molar ratio = 0.083/0.083 = 1 : 0.168/0.083 = 2
molar ratio = 1:2
Sample 3: Carbon; 1.5/12 = 0.125 : Oxygen; 4.0/16 = 0.250
molar ratio = 0.125/0.125 = 1: 0.250/0.125 = 2
molar ratio = 1:2
Carbon and oxygen are combined in a constant mole ratio in all the three samples of carbon dioxide
C. All pure samples of a compound contain the same elements combined in the same proportion by mass
D. Since the same elements are always combining to form a certain compound, and the atoms of each element has its own mass, the atoms of each element combining to form the compound do so in a fixed proportion by mass.
how does chemical weathering change rock
Answer:
Not to be rude but its in there. Hope this helps
Explanation:
Chemical weathering changes the molecular structure of rocks and soil. For instance, carbon dioxide from the air or soil sometimes combines with water in a process called carbonation. This produces a weak acid, called carbonic acid, that can dissolve rock.
What is commonly used to run a central heating system?
solar energy
electrical energy
geothermal energy
nuclear energy
Which of the following statements describes the interaction of water molecules with phospholipids? Which of the following statements describes the interaction of water molecules with phospholipids? The polar heads avoid water; the nonpolar tails attract water (because water is polar and opposites attract). The polar heads interact with water; the nonpolar tails do not. Phospholipids do not interact with water because water is polar and lipids are nonpolar. Phospholipids dissolve in water.
Answer:
The polar heads interact with water; the nonpolar tails do not
Explanation:
A phospholipid contains an ionic head that contains the phosphate group and the nonpolar or hydrophilic tail that is comprised of the alkyl moeity in the phospholipid.
The hydrophilic ionic head can interact with water, while the hydrophilic alkyl tail do not interact with water, hence the answer above.
Calculate the mass of water change if the density is 1.02 g/ml and the volume is 62 ml?
Answer:
65.72 g
Explanation:
mass = density × volume
= 1.02 g/ml × 62 ml
= 65.72 g
What is described by the VSEPR theory?
O A. The arrangement of atoms in a molecule
B. The oxidation numbers of atoms in a molecule
C. The kind of bonds formed in a molecule
O D. The outside forces operating on a molecule
Answer:
A
Explanation:
Apex
The arrangement of atoms in a molecule is described by the VSEPR theory.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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A tank contains 120.0 g chlorine gas (Cl2), which is at temperature 76.0°C and absolute pressure 5.70 ✕ 105 Pa. The temperature of the air outside the tank is 19.0°C. The molar mass of Cl2 is 70.9 g/mol. (a) What is the volume of the tank (in m3)? m3 (b) What is the internal energy of the gas (in J)? J (c) What is the work done by the gas (in J) if the temperature and pressure inside the tank drop to 31.0°C and 3.80 ✕ 105 Pa, respectively, due to a leak? (Assume that the air outside the tank can be treated as a vacuum.)
Answer:
Explanation:
Given that:
mass of chlorine gas = 120.0 g
the molar mass of Cl₂ = 70.9 g/mol
The number of moles of chlorine gas = mass/molar mass
The number of moles of chlorine gas = 120.0 g / 70.9 g/mol
The number of moles of chlorine gas = 1.69 mol
Pressure = [tex]5.70 \times 10^5 \ Pa[/tex]
Temperature = 19.0°C = (273 + 76) K = 349 K
Universal Gas constant R = 8.314 J/mol/K
Using Ideal gas equation:
PV = nRT
V = nRT/P
V = (1.69 × 8.314 × 349)/ [tex]5.70 \times 10^5[/tex]
V = 4903.68034/ [tex]5.70 \times 10^5[/tex]
V = 0.008603 m³
Thus, the volume V of the tank = 0.008603 m³
For diatomic gas, the internal energy can be calculated by using the formula:
internal energy [tex]E_{int}[/tex] = [tex]\dfrac{5}{2} \times nRT[/tex]
internal energy [tex]E_{int}[/tex] = [tex]\dfrac{5}{2} \times 1.69 \times 8.314 \times 349[/tex]
internal energy [tex]E_{int}[/tex] = 12259.2 J
If there is a temperature and pressure drop;
the new temperature = 31.0°C = (273 + 31) K = 304 K
the new pressure = [tex]3.80 \times 10^5 \ Pa[/tex]
We need to understand that the aftermath of the reduction in chlorine gas resulted in a decrease in temperature and pressure. Since nothing is affecting the volume of the chlorine gas, then there is no work done.
Thus, work done will be zero because there is no change in the volume or an isochoric process.
How many atoms of Titanium are in 3 moles?
Explanation:
Because There are 6.022x10^23 atoms per mole; therefore, (6.022x10^23×3)=18.066x10^23 atoms of titanium.
type of force assessment for midd school
2
3
4
5
20
Which refers to any disturbance that carries energy from one place to another?
wave
O trough
O motion
O crest
Answer:
its A) wave
Explanation:
edge2020
Answer:
A: Wave
Explanation:
Got it right on edge
the number of oxygen atoms (O) in 0.24g of calcium carbonate Ca CO3
Answer:
4.3 × 10²¹ atoms
Explanation:
Step 1: Calculate the moles corresponding to 0.24 g of CaCO₃
The molar mass of CaCO₃ is 100.09 g/mol.
0.24 g × (1 mol/100.09 g) = 2.4 × 10⁻³ mol
Step 2: Calculate the moles of oxygen in 2.4 × 10⁻³ moles of CaCO₃
The molar ratio of CaCO₃ to O is 1:3. The moles of O are 3/1 × 2.4 × 10⁻³ mol = 7.2 × 10⁻³ mol
Step 3: Calculate the number of O atoms in 7.2 × 10⁻³ moles of O
We will use Avogadro's number: there are 6.02 × 10²³ atoms of O in 1 mole of atoms of O.
7.2 × 10⁻³ mol × (6.02 × 10²³ atoms/1 mol) = 4.3 × 10²¹ atoms
A student is in class 400 minutes every day for 5 days each week. How many seconds
Is this?
Conversion factors: 1 day = 24 hours; 1 hour = 60 minutes; 1 minute = 60 seconds
120,000 sec
1,200,000 sec
12,000 sec
60,000 sec
If a student is in class 400 minutes every day for 5 days each week, then there would be 120000 seconds, therefore the correct answer is option A.
What is multiplication?Finding the product of two or more numbers in mathematics is done by multiplying the numbers. It is one of the fundamental operations in mathematics that we perform on a daily basis.
As given in the problem If a student is in class 400 minutes every day for 5 days each week,
The number of minutes a student in class in a day = 400 minutes
The number of seconds a student in class in a day = 400 × 60 seconds
The number of seconds a student in class in a week = 400 × 60 × 5 seconds
The number of seconds a student in class in a week = 120000 seconds
Thus, the correct answer is option A.
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NH3 + HCI —> NH4CI synthesis O decomposition O single replacement O double replacement
Answer:
synthesis
Explanation:
The reaction given is a synthesis reaction or combination reaction.
Given equation:
NH₃ + HCl → NH₄Cl
In a synthesis reaction, a single product is formed from two or more reactants
A + B → C
The formation of compounds from the union of constituent elements also falls into this category.
So the given reaction is a synthesis reaction.
In a decomposition reaction two or more products are formed from a single reactant
In a single replacement reaction, one substance replaces another.
In double replacement reactions partners in a chemical specie are exchanged.
Therefore the given reaction is a synthesis reaction
What is required for sexual reproduction to occur? an individual that produces sperm and an individual that produces eggs an individual that produces sperm and an individual that produces spores an individual that produces buds and an individual that produces spores an individual that produces buds and an individual that produces eggs
Answer:
It is A.
Explanation:
I hope this helps have a great day.
Answer:
A
Explanation:
an individual that produces sperm and an individual that produces eggs
you need egg and sperm for a new offspring aka a zygote
Which determines the reactivity of an alkali metal?
A) its boiling and melting points
B) the shininess of its surface
C) the number of protons it has
D) its ability to lose electrons
ill give brainliest
Answer:
D
Explanation:
It only has one valence electron.
HELPPPP MEEE PLEASEEE!!!!!!
If you have 40 protons, 30 neutrons, and 42 electrons, which of the following is
true? (There are multiple answers!) *
Mass = 40
Mass = 70
Mass = 82
Mass = 112
Charge = -2
Charge = +2
Charge = +10
Charge = -10
Which subatomic particle is positively charged?
Proton
Neutron
Electron
What molecules does a plant need to make glucose in the process of photosynthesis? Choose all correct answers. carbon dioxide light oxygen water
Answer: carbon dioxide and water.
Explanation: I took the test
Answer:
water and carbon dioxide
Explanation:
i took the K12 test :p
What is the symbol for the element with the atomic number 8
Answer: O
Explanation: oxygen
Explain how viscosity is related to the flow and attraction between atoms in a liquid.
(7th grade science)
Answer:
Sample Response: Viscosity refers to a liquid’s resistance to flow. Liquids with a higher viscosity flow more slowly. In liquids that are more viscous, there is a stronger attraction between atoms.
Explanation:
it's the sample response so it's correct lol, I hope it helps.
Answer:
Sample Response: Viscosity refers to a liquid’s resistance to flow. Liquids with a higher viscosity flow more slowly. In liquids that are more viscous, there is a stronger attraction between atoms.
Explanation:
Edge 2021
Physics
Identify the number with the correct number of significant figures for each step of the calculation and for the final answer. Note that 2 is an exact number. y equals 2.10 StartBracket 9.0 plus 2 times 35.35 EndBracket. 2 (35.35) =
Answer: The answer is 167
Explanation: This is because that was right on edg. so yea heart this tho plsss
Answer:
70.70
Explanation:
Just got it right on edge
Select all that apply: Tonicity of a solution Check All That Apply is related to solute content.is related to solute content. is related to the pH of the solution.is related to the pH of the solution. gives information about potential changes in cell volume when cells are placed in that solution.gives information about potential changes in cell volume when cells are placed in that solution. is closely related to the temperature of the solution.is closely related to the temperature of the solution. is related to membrane permeability to solutes.
Answer:
.✓is related to the solute content
✓gives information about potential changes in cell volume when cells are placed in that solution
√is related to membrane permeability to solutes.
Explanation:
Tonicity of a solution can be explained as how an extracellular solution can give room for the liquid to move in and out of the cell through osmosis.
It should be noted that Tonicity of a solution is
.✓is related to the solute content
✓gives information about potential
changes in cell volume when cells are placed in that solution
√is related to membrane permeability to solutes.
15. Excited sodium atoms emit light in the infrared at 589 nm. What is the energy of a single photon with this wavelength?
Answer:
3.36 × 10^-19 J
Explanation:
From the formula;
E= hc/wavelength
h= 6.6 ×10^-34 Js
c= 3 × 10^8 ms-1
Wavelength= 589 ×10^-9 m
E= hc/ wavelength
E=6.6 ×10^-34 × 3 × 10^-8/ 589 ×10^-9
E= 3.36 × 10^-19 J
PSYCHOLOGYDescribe how sensation and perception work together.
Answer:
Perception is the psychological process in which sensory input is organized and interpreted into meaningful information. The sensory and perceptual processes work together so that organisms can make sense out of objects or events that appear in their environment. For example, when looking at a cat, one senses a combination of shapes and colors. The mind instantly processes these visual sensations into something meaningful, letting one know it's a cat.
Explanation:
^^
Answer:
Perception is the psychological process in which sensory input is organized and interpreted into meaningful information. The sensory and perceptual processes work together so that organisms can make sense out of objects or events that appear in their environment. For example, when looking at a cat, one senses a combination of shapes and colors. The mind instantly processes these visual sensations into something meaningful, letting one know it's a cat.
Explanation:
Edge 2021
Which has the lowest density? *
Wood
Iron
Water
gold
Is table salt a mixture ?
True
False
Answer:
True
Explanation:
Table sugar and table salt are pure substances....When elements chemically combine, they form compounds that have properties that are similar to those of the uncombined elements.
Different ____ of an element have different numbers of neutrons
Answer:
different elements have different numbers of neutrons.
Which starch solution will decrease in volume as osmosis occurs?
Which of the following can be classified as a substance?
A. Bar of gold
B. Newspaper
C. Nail polish
D. Chocolate chip cookie
Question :
Melting gold to make new earring is
a
O Physical Change
O
Chemical Change
O
Periodic change
O
Irreversible
Answer:
If the earring is still gold it is a physical change.
Explanation:
Melting something can be a chemical change but since the gold is still gold its physical. Physical actions, such as changing temperature or pressure, can cause physical changes. No chemical changes took place when you melted the ice. The water molecules are still water molecules.
The smallest possible particle of an element is a
Answer:
An atom is the smallest particle of an element that still has the properties of that element. Atoms, in turn, are composed of subatomic particles, including negative electrons, positive protons, and neutral neutrons. The number of protons in an atom determines the element it represents.
Explanation:
The smallest possible particle of an element is a atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons.
What is atom?The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. Electric forces, which link electrons towards the nucleus of atoms, cause them to be drawn to any positive charge.
Space makes up the majority of an atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons. Compared to electrons, that are the smallest charged particles in nature, the nucleus is tiny and dense.
Therefore, the smallest possible particle of an element is a atom.
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